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First thing to try is the default username and password for the given brand of router. About 4 times out of 5 the default password will work. If it doesn't, then you've two options:
1) Brute-force: You can try a bazillion passwords and hope one of them works
2) Sniffing: You can wait for someone else on the network to access the router settings and then you sniff the password

Ask questions on the open forums, that way everybody benefits from the solution, and everybody can be corrected when they make mistakes. Don't send me private messages asking questions that should be asked on the open forums, I won't respond. I decline all "Friend Requests".

i have tried all the default passwords, but they changed it definetely!

i will try brute force out.
thank you man!

Of course, if you really wanted to have some fun, go to Wal-Mart late at night and ask the greeter if they could help you find trashbags, roll of carpet, rope, quicklime, clorox and a shovel. See if they give you any strange looks. --Streaker69

i have tried all the default passwords, but they changed it definetely!

i will try brute force out.
thank you man!

Then maybe you should ask whomever 'They' are.

A third party security audit is the IT equivalent of a colonoscopy. It's long, intrusive, very uncomfortable, and when it's done, you'll have seen things you really didn't want to see, and you'll never forget that you've had one.